Economical duplex stainless steel with tensile strength larger than 1000 MPa and manufacturing method thereof

A technology of duplex stainless steel and tensile strength, applied in the field of duplex stainless steel manufacturing, to achieve the effect of reducing alloy cost and improving tensile strength

Active Publication Date: 2015-12-30
BAOSTEEL DESHENG STAINLESS STEEL
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the current main research direction of economical duplex stainless steel is to reduce the cost of the material while improving the excellent corrosion resistance, and it does not involve how to improve the tensile strength of the material

Method used

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  • Economical duplex stainless steel with tensile strength larger than 1000 MPa and manufacturing method thereof
  • Economical duplex stainless steel with tensile strength larger than 1000 MPa and manufacturing method thereof
  • Economical duplex stainless steel with tensile strength larger than 1000 MPa and manufacturing method thereof

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Embodiment 2

[0065] The change of martensite content in the structure during the steel stretching process of embodiment 2 is as follows figure 2 shown. The tensile sample is manufactured according to the JIS-13B standard, stretched on the MTS-810 stretching machine in accordance with GB / T228-2007, after stretching to a predetermined amount of deformation, stop and unload, and then measure the magnetic properties before and after stretching with a magnetic instrument Change, in order to confirm whether martensite is produced during the stretching process and roughly confirm the amount of martensite. The change of martensite content in the organization in the elongation process of embodiment 2 steel is as follows figure 2 shown. Depend on figure 2 It can be seen that in the process of tensile deformation, part of the austenite undergoes phase transformation to form deformed martensite, which is the key reason for the significant increase in its tensile strength.

[0066] The mechanica...

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Abstract

The invention discloses economical duplex stainless steel with the tensile strength larger than 1000 MPa and a manufacturing method thereof. The economical duplex stainless steel is manufactured from, by weight, 0.01-0.08% of C, 0.1-0.8% of Si, 0.8-5.0% of Mn, 18.0-20.5% of Cr, 0.5-2.5% of Ni, 0.07-0.15% of N, 0-0.5% of Mo, 0-1.0% of Cu and the balance Fe and unavoidable impurities, wherein the equations of 115 DEG C<=Md30/50<=145 DEG C and Md30/50=(580-520C-2Si-16MN-16Cr-23Ni-300N-26Cu-10Mo)DEG C are met. The tensile strength is larger than 1000 MPa, the tensile strength of the duplex stainless steel is significantly improved, and the duplex stainless steel can be applied in the field with high requirement for the tensile strength such as the technical fields of automobiles, track traffic and movable pots and boxes.

Description

technical field [0001] The invention relates to the manufacture of duplex stainless steel, in particular to an economical duplex stainless steel with a tensile strength greater than 1000 MPa and a manufacturing method thereof. Background technique [0002] Duplex stainless steel is composed of nearly equal proportions of ferrite and austenite at room temperature. Therefore, duplex stainless steel has the advantages of both ferritic stainless steel and austenitic stainless steel. Compared with austenitic stainless steel, the strength of duplex stainless steel, especially the yield strength, is significantly improved, which is about twice that of austenitic stainless steel, mainly because duplex stainless steel contains higher N content, finer grain and reinforcement due to two-phase interactions. In addition, intergranular corrosion resistance, stress corrosion resistance, corrosion fatigue resistance and wear resistance of duplex stainless steel are all significantly improv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/58C22C38/44C22C33/04
Inventor 胡锦程宋红梅江来珠
Owner BAOSTEEL DESHENG STAINLESS STEEL
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